Riding history

The federal riding was created in 2003 from 68 per cent Whitby—Ajax, 20 per cent of Oshawa and three per cent of Durham. The provincial electoral district was created from the same ridings in 2007.

It consists of the Town of Whitby and northwestern section of the City of Oshawa (specifically, the portion of the city lying north and west of a line drawn from the western city limit east along King Street West, north along the Oshawa Creek, east along Rossland Road West, north along Simcoe Street North, and east along Winchester Road East to the eastern city limit).